Bearing for shafts, spindles, and the like.



G. L. PRATT. BEARING FOR SHAFTS, SPINDLES, AND THE LIKE.

APPLICATION FILED JAN. 30- 1 912. I

Patented Nov. 7, 1916.

w J 6 m 7 m GEORGE L. PRATT, OF ATLANTA, GEORGIA.

BEARING FOR SHAFTS, SPINDLES, AND THE LIKE.

Specification of Letters Patent.

Patented Nov. 7, 1916.

Application filed January 30, 1912. Serial No. 674,391.

To all whom it may concern Be it known that I, GEORGE L. PRATT, acitizen of the United States, residing at Atlanta, in the county ofFulton and State of Georgia, have invented certain new and usefulImprovements in Bearings for Shafts, Spindles, and the like, of whichthe following is a specification, reference being had therein to theaccompanying drawing.

This invention relates to dust-proof bearings, and particularlycontemplates a construction which is adapted for use inpulverizer-rolls.

It is the object of my invention to provide in such a machine means tomaintain the bearing faces or surfaces in such intimate contact at alltimes and under all conditions of operation that the entrance of dust,etc., is precluded.

It is also an object of my invention to simplify the construction of theparts in order that, should replacement be necessary,

it can quickly and conveniently be-accomplished, and without requiringthe stopping of the pulverizing machine for any extended time.

With these and other objects in view, the invention resides in the novelconstruction, combination and relative aggroupment of the parts, all asmore fully explained and claimed hereinafter.

In the accompanying drawings, I have illustrated some of the embodimentsof my invention and these will suffice to indicate, first, theunderlying principle of my invention, and, secondly, the various formsin which the invention may be embodied. It is to be understood that I-donot limit myself to the details of construction nor to the precise formsof the parts, since these may be varied to a considerable degree and yetbe within the spirit of the invention.

In these drawings: Figure 1 is a View in vertical section of a portionof a pulverizer roll; Fig. 2 is a view in bottom plan-thereof; Fig. 3 isa detail view of a resilient collar-holding member forming a part of myimproved bearing; Fig. 4 is a view in crosssection of said collar andshowinga plurality of split-rings which embrace it; Figs. 5, 6, 7 and 8are fragmentary views showing some of the many possible forms ofcontacting surfaces with which said collar may be provided. I

Referring to the drawings: The numeral 1 designates a shaft or spindleupon which my improved dust-proof bearing is adapted to be mounted. Thisshaft or spindle may be that which forms an essential part of apulverizer roll. In this instance, the shaft 1s preferably made ofmachined steel.

Surrounding the shaft for a portion of its Iength is a preferablycold-drawn steel sleeve 2 which is shrunk onto the shaft and serves asthe active wearing surface for said shaft and whereby the latter isprotected from wear. By reason of the high cost of the shaft, and theexpense of replacing it after becoming worn, I have found it desirableto surround the shaft with the replaceable sleeve. It is to beunderstood that I may omit the sleeve and, then, the shaft would provideits own wearing surface. Surrounding said sleeve for a portion of itslength, is a roll-bushing 3, preferably made of bronze. It will beunderstood that this bushing has a rotative movement upon the sleeve, orupon the shaft when the sleeve is omitted. The lower end of the bushing3 is turned outwardly to provide a flange 3; and, in the bore of thebushing is provided an oil-groove 3".

Embracing the bushing, is a tubular element 4, preferably made of castiron. This tubular element is enlarged at its lower portion, as shown,to provide a support for a roll-member 5. The bore of the tubularelement is offset, at 4, and into this offset the flange 3 of thebushing is adapted to fit.

Secured (as by bolts 6, 6) or otherwise clamped to the lower end of theroll-core is a bottom-plate"? which, as shown, is provided with anupwardly extending portion 7*, the upper edge of which engages the lowerface of the flange 3 This bottomplate is chambered, as shown, to form ahousing for the head 1 of the shaft.

It will be observed that some of the bolts 6 have elongated heads 6,whereby they serve as plow-bolts.

Underlying the head 1 of the shaft and also housed therewith in thechambered ortion of the bottom-plate 7 is a frictionisk 8, the peripheryof which is provided with oil-recesses 8, as shown.

Surrounding the upper end of the shaft 1 is a. tapered bushing 9, thesame being threaded onto the shaft, as shown; and upon this bushing ismounted a trunnion-head 10, the same belng firmly secured to the bushingby means of the lock-nut 11 which is screwed onto the threaded end ofthe bushing 9. To

prevent said lock-nut from working loose, a nut-lock 12 is secured tothe trunnion and has an angular extension which engages the face of thenut.

As illustrated in Fig. 1, the upper end of the roll-core 4 is providedwith a flange 4 having an extended contacting surface 4. Bolted orotherwise secured to said flanged portion of the roll-core 4 is agland-member 13, the same comprising a body-portion 13*, an angulatedportion 13 adapted to bear against the contacting surface 4 of therollcore, and an inwardly projecting flange 13. As shown, the lower endof the body-portion 18 embraces the upper extremity of the bushing 3,while the flanged portion 13 embraces the shaft sleeve 2. Disposed inthe space or chamber formed by body-portion 13, the upper end of thebushing 3, and the flange 13, are a plurality of fiber-rings 15, or thelike.

Immediately above the gland-member 13 and adapted to have frictionalcontact therewith is a friction-collar 16 which, as shown, has abearing-face at its lower end commensurate with the upper surface of theflanged portion 13 of the gland-member. This friction-collar isyieldingly maintained against said gland-member by holding collar 17formed of some resilient material and preferably rubber. The upper endof the friction-collar is provided with an upstanding extension 16adapted to be seated in a correspondingly-formed annular recess 17 inthe resilient holding collar 17.

The friction-collar is preferably split and formed of bronze and, asshown, has a sliding-fit on the shaft sleeve 2. It is provided with anannular groove 16 adapted to receive two split snap-rings 18 and 19, thesame being so placed on the collar as to break joints therewith and witheach other, as illustrated in Fig. 4.

The resilient holdin -collar is, as shown in Fig. 3, split longituinally, and is caused to embrace the sleeve 2- and the frictioncollar byreason of its being encircled by a plurality of split-rings 20. lVhere,as in the form shown in the drawings, said holding-collar is made ofrubber, it will firmly grip the upstanding portion 16 of thefriction-collar. Being itself firmly gripped upon the shaft and collar,as shown, it holds itself against any rotative movement. Similarly, byreason of its gripping action upon the friction-collar, its function isto hold the same against any rotative movement and, yet, permit it tohave a slight longitudinal movement on the sleeve. In other words, therubber collar yieldingly maintains the friction-collar against the gland13. It also serves to prevent the entrance. of dust into the hearing atthe points where this rubber collar embraces the shaft sleeve. To thisend, it is provided with an inwardly extending, annular flange 17 b thattightly encircles the shaft, as shown in Fig. 1.

It will be understood that the shaft 1 and its sleeve 2 arenon-rotatable, and similarly are the collars 16 and 17 The gland 13 androll-core 4 with the roll are rotatable relatively to the shaft. Theform and operation of the friction-collar 16 are such that it ismaintained constantly against the gland at all times without partakingof any of its rotative movement. In the event that the roll-core runs atall out of t1 us, as a result for instance of wear, the friction-collarwill be maintained tightly against the bearingsurface of the gland, andthis result follows from the pressure exerted upon said collar by therubber holding-collar. In this way, no separation, even slight, ispermitted by the collar 16 from the gland. In consequence, no dust ispermitted entrance vat this point.

Oil is supplied to the parts through the oil-duct 21 extendinglongitudinally through the center of the shaft. The oil feedstherethrough and around the recesses 8 in the friction-disk 8 andupwardly along the oilgroove 3 The washers 15 serve to prevent the oilfrom working its way out between any of these contacting parts. If anydoes leak out, it will constitute itself into a. vehicle to carry outany dust that may be at the edges. This is due to the fact that the highcentrifugal force developed during the operation of the roll will tendto cause an outward tendency of action of any fluidwhether it be air oroiland this serves further to preclude entrance of dust, etc.

In Figs. 3 to 8 inclusive, I have illustrated various forms ofcontacting surfaces on the lower end of the frictioncollar and the upperend of the gland, and whereby the entrance of dust would ordinarily beprevented. These will serve sufficiently well under ordinarycircumstances and provided there has been no substantial wear of theparts whereby play between them may be possible. Under these conditions,however, I prefer to employ the form of flat contacting surfacesillustrated in Fig. 1, for the reason that these flat contactingsurfaces will allow a requisite sliding movement of the surfaces on eachother necessary to permit them to be maintained in intimate contact,under the pressure-existing influence of the resilient holding-collar 17The friction-collar 1.6 is, as already specified, preferably made ofbronze because of its recognized valuable characteristics for suchpurposes. By reason of its being split, it can conveniently be replaced.To do this, it is only necessary to force the rubber collar away fromit, then remove the split-rings 19 too, is split and held only by thesplitring 20.

It is obvious that my invention is susceptible of considerablemodification. The essential features are the provision in abearing forshafts, spindles and the like, of a relatively non-rotatable frictionmember, a contacting member, and means .for yieldingly maintaining saidfriction-member against rotative movement but in intimate contact withsaid contacting member.

It will of course be manifest that, in some instances, the shaft and itssleeve, with the friction-collar and the specified holding means, may berotatable and the roll-core and gland be stationary in relation thereto.

Having thus described my invention, the preferredconstruction andarrangement of the parts, and their mode of operation, What I claim is:

1. A hearing including in combination, a shaft provided with acircumferential shoulder, a friction collar encircling the shaft, agland member also encircling the shaft and coaxial with said collar andagainst which the collar is held, and a resilient collar embracing theshaft at the shouldered portion thereof and normally diameter of thefriction collar and gland member for effecting the longitudinal movementof the friction collar into contact With the gland member.

2. A bearing including in combination, a shaft provided with acircumferential shoulder, a relatively non-rotatable friction collarencircling the shaft, a glandmember also encircling the shaft andcoaxial with said collar and against which the collar is held, and aresilient collar embracing the shaft at the shouldered portion thereofand also embracing a portion of the friction collar and adapted to pressthe friction collar against the gland member.

3. A bearing including in combination, a shaft provided with acircumferential shoulder a relatively non-rotatable friction collarencircling the shaft, a gland member also encircling the shaft andcoaxial with said collar and against which the collar is held, and aresilient collar embracing the shaft at the shouldered portion thereofand relatively non-rotatable, whereby it holds the friction collaragainst rotative movement and in intimate engagement with the glandmember.

4. A hearing including in combination, a shaft provided withacircumferential shoulder, a gland member encircling the shaft androtatable about the same, a resilient collar embracing the shaft at theshouldered portion thereof and relatively non-rotatable, and a frictioncollar interposed between 'silient collar approximating the saidresilient collar and the gland member and partly embraced by theresilient collar.

5. A hearing including in combination, a shaft provided with ashouldered portion, a core member rotatable about the shaft, a glandmember secured to the core member and encircling the shaft, a resilientcollar provided with a flange embracing the shaft at the shoulderedportion thereof, a friction collar interposed between the resilientcollar and the gland member and held by the reagainst rotative movementwhile the gland and core members are rotating about the shaft.

6. A bearing including a shaft, a core member encircling and rotatableabout the shaft, a gland member encircling the shaft and attached to thecore member and movable therewith, a resilient collar having a flangeembracing the shaft at a shouldered portion thereof, and a frictioncollar interposed between the resilient collar and the gland member andprovided with a flange embraced by the resilient collar and held therebyagainst rotation with the gland member.

7. A hearing for shafts of pulverizerrolls and the like, including arelatively stationary shaft, a core member encircling and rotatableabout the shaft, a gland member encircling the shaft and attached to thecore member, a resilient collar embracing the shaft, and a frictioncollar contacting with the gland member and provided with a flangeembraced by the resilient collar and held non-rotatable therewith duringthe rotative movement of the land member.

8. A bearing for sha ts of pulverizerrolls and the like, including ashaft provided with a circumferential collar, a coremember encirclingand rotatable about the shaft, a gland member secured to the core memberand provided with an inwardly extending flange to present acollar-engaging surface, a resilient collar encircling the shaft andprovided with-an inwardly extending flange which embraces the shaft atthe shouldered portion thereof and provided, also, with an annularrecess, and a friction collar encircling the shaft and provided with anannular flange seated in the recess in the resilient collar and having africtional engagement with the collar-engaging surface of the glandmember.

GEORGE L. PRATT.

Witnesses:

A. M. PARKINS, EDMUND H. PARRY.

